CsI(Tl)
From Detec-Rad.com
CsI(Na) is a good alternative for NaI(Tl) in many standard applications because i
- high light output (85% of that of NaI(Tl)),
- maximum light emission is in the blue spectral region (550 nm):
- coincides with the maximum sensitivity of the most popular PMT with bialkali photocatodes
- can be associated with Si photodiodes, thus reducing significantly the size of the detection system, without HV power supply, and without sensitivity to magnetic fields.
- hygroscopicity substantially lower than that of NaI(Tl).
- resistant
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Applications
- Particle physics and high energy physics
- General detection
- Photodiode readout
- Phoswiches
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Technical Data
| CsI(Tl) | |
| Density (g/cm3) | 4.51 |
| Melting point (K) | 894 |
| Thermal expansion coefficient (K-1) | 49x106 |
| Cleavage plane | none |
| Hardness (Mho) | 2 |
| Hygroscopic | slightly |
| Wavelength of maximum emission (nm) | 550 |
| Refractive index at maximum emission | 1.79 |
| Light output (for γ rays)(% of NaI(Tl)) | 45 |
| Primary decay time (ms) | 1 |
| Afterglow (after 6ms) (%) | 0.1 |
| Lower wavelength cutoff (nm) | 320 |
